RISK FACTORS

         An investment in our ADSs involves significant risks. You should consider carefully all of the information in this prospectus, including the risks and uncertainties described below, before making an investment in our ADSs. Any of the following risks could have a material and adverse effect on our business, financial condition and results of operations. In any such case, the market price of our ADSs could decline, and you may lose all or part of your investment.

Risks Related to Our Business and Industry

We operate in highly competitive markets, and the scale and resources of some of our competitors may allow them to compete more effectively than we can, which could result in a loss of our market share and a decrease in our net revenues and profitability.

        We have developed an IoT @ Home platform consisting of an ecosystem of IoT-enabled smart home products, complementary consumable products and value-added businesses. We face intense competition from other smart home solution providers, internet companies, and traditional home appliances companies. We also face regional competition from local brands in the various geographies where our products are sold. We compete in various aspects, including brand recognition, value for money, user experience, breadth of product and service offerings, product functionality and quality, sales and distribution, supply chain management, customer loyalty, and talents, among others. Intensified competition may result in pricing pressures and reduced profitability and may impede our ability to achieve sustainable growth in our revenues or cause us to lose market share. Our competitors may also engage in aggressive and negative marketing or public relations strategies which may harm our reputation and increase our marketing expenses. Any of these results could substantially harm our results of operations.

        Some of our existing and potential competitors enjoy substantial competitive advantages, including: longer operating history, the capability to leverage their sales efforts and marketing expenditures across a broader portfolio of products, more established relationships with a larger number of suppliers, contract manufacturers and channel partners, access to larger and broader user bases, greater brand recognition, greater financial, research and development, marketing, distribution and other resources, more resources to make investments and acquisitions, larger intellectual property portfolios, and the ability to bundle competitive offerings with other products and services. We cannot assure you that we will compete with them successfully.

As we continue to grow, we may not be able to effectively manage our growth and the increased complexity of our business, which could negatively impact our brand and financial performance.

        Since our founding in May 2014, we have experienced rapid growth. Continued growth of our business and household user base requires us to expand our product portfolio, strengthen our brand recognition, expand and enhance our sales channels, better manage our supply chain, upgrade our information systems and technologies, secure more space for our expanding workforce, and devote other resources to our business expansions, among others. As we continue to grow, managing our business will become more complicated as we develop a wider product and service mix, some of which we may have less experience in. In addition, as we increase our product and service offerings, we will need to work with a larger number of business partners and maintain and expand mutually beneficial relationships with our existing and new business partners.

        We cannot assure you that we will be able to effectively manage our growth, that our current personnel, infrastructure, systems, procedures and controls or any measures to enhance them will be adequate and successful to support our expanding operations or that our strategies and new business initiatives will be executed successfully. If we are not able to manage our growth or execute our strategies effectively, our expansion may not be successful and our business and prospects may be materially and adversely affected.

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        We have experienced certain operating difficulties in the past in ramping up certain of our contract manufacturers' production in a timely manner to meet the increasing demand and purchase orders from our customers. As we continue to expand, we may experience similar difficulties if we are unable to manage our growth, which may adversely affect our reputation and results of operations.

We have a limited operating history, which makes it difficult to evaluate our future prospects.

        We were established in May 2014 and launched our first product in 2015. As we only have a limited history of operating our business at its current scale, it is difficult to evaluate our future prospects, including our ability to plan for our future growth. Our limited operating experience, substantial uncertainty concerning how the IoT-enabled smart home market in China may develop, and other economic factors beyond our control, may reduce our ability to accurately forecast demand for our products and accordingly, our quarterly or annual revenues. As such, any predictions about our future revenues and expenses may not be as accurate as they would be if we had a longer operating history or operated in a more developed and predictable market.

Xiaomi is our strategic partner and our most important customer. Any deterioration of our relationship with Xiaomi could have a material adverse effect on our operating results.

        Xiaomi is our strategic partner and our most important customer. We sell a wide range of products to Xiaomi, including Xiaomi-branded water purification systems, water purifier filters, as well as other complementary products such as kettles and water quality meters. We may discuss with Xiaomi to expand the product categories that we collaborate with Xiaomi on, which may lead to increase of revenues from Xiaomi, but there is no assurance that such discussion and expansion of cooperation will materialize. Historically, we recorded RMB299.8 million, RMB739.5 million (US$111.8 million) and RMB651.5 million (US$98.5 million) in net revenues from sales to Xiaomi in 2016, 2017 and the six months ended June 30, 2018, respectively, which represented 95.9%, 84.7% and 62.6% of our total net revenues during such periods respectively. We recover all our production costs when we sell our products to Xiaomi, and are additionally entitled to a portion of the respective gross profit when Xiaomi sells these products to end-users. Various reasons may lead to Xiaomi's failure to sell these products, many of which are not within our control, including those related to Xiaomi but unrelated to the products we produced and risks that we could not preempt or prevent with commercially reasonable efforts.

        The sales of our products to Xiaomi are governed by a business cooperation agreement, which will be automatically renewed upon the expiration of the current term in August 2019, unless objected by a party at least 30 days prior to the expiration date. We also sell our own Viomi-branded products through Xiaomi's e-commerce platform, Youpin.mi.com , directly to consumers, pursuant to a commission sales agreement with Xiaomi, which will expire on December 31, 2018 with no automatic renewal provision. We will initiate good faith negotiations with Xiaomi to renew the agreement near the end of the term. In the past, we successfully replaced a commission sales agreement with Xiaomi for sales through the predecessor of Youpin.mi.com that expired on December 31, 2017 with the current Youpin commission sales agreement. However, we cannot assure you that we will be able to renew the business cooperation agreement or the commission sales agreement, or on the same or more favorable terms. In addition, both agreements are subject to early termination by Xiaomi under certain circumstances. For more details of the agreements with Xiaomi, including conditions for early termination, please see the section titled "Related Party Transactions—Our Relationship with Xiaomi." If, for any reason, we cannot maintain our cooperation relationship with Xiaomi or Xiaomi significantly reduces or ceases purchases from us, our business and results of operations may be materially and adversely affected.

        Furthermore, Xiaomi sells a broad spectrum of electronic products, including our Xiaomi-branded and our self-branded products, as well as products unrelated to us through its various sales channels. We cannot assure you that our products can always receive the same level of attention and promotion efforts from Xiaomi thus far. If Xiaomi dedicates less resources to promoting and selling our products or

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introduces products that compete with ours, our net revenues may decrease as well. Negative publicity related to Xiaomi, including products offered by Xiaomi unrelated to us, the celebrities Xiaomi are associated with, or even the labor policies or environmental issues of any of Xiaomi's suppliers or manufacturers, may also have a material adverse effect on the sales of our products and public recognition of our brand.

        Xiaomi is also a shareholder of our Company. Xiaomi is a public company listed on the Stock Exchange of Hong Kong. When exercising its rights as our shareholder, Xiaomi may take into account not only the interests of our Company and our other shareholders but also its own interests, the interests of its public shareholders and the interests of its other affiliates. The interests of our Company and our other shareholders may at times conflict with the interests of Xiaomi and its public shareholders and other affiliates. Such conflicts may result in losing business opportunities for us, including opportunities to enter into lines of business that may overlap with those pursued by Xiaomi or the companies within its ecosystem. Currently, we do not have any formal processes to address such conflicts.

Our future success depends on our ability to promote our brand and protect our reputation. Our failure to establish and promote our brand and any damage to our reputation will hinder our growth.

        We utilize a number of marketing initiatives to promote our brand. For example, we have engaged a popular Chinese celebrity (Ms. Mi Yang) as our brand ambassador. We have sponsored popular TV shows in China such as Negotiator , Who's the Detective , and Come Sing With Me , to help display and demonstrate our IoT products. We also actively participate in a variety of online and offline marketing events, such as the "Singles' Day" and "Double Twelve" shopping festivals. We believe our strategy to enhance our brand recognition is crucial to our future success. We have invested, and will need to continue to dedicate, significant time, efforts and resources to advertising and market promotion initiatives. Our sales and marketing expenses were RMB146.6 million (US$22.2 million) for the six months ended June 30, 2018, representing 14.1% of our net revenues, a substantial increase from the same period of 2017. We may need to devote an even greater portion of our resources to continue to strengthen our brand recognition and build our user base, which may impact our profitability. We cannot guarantee that our marketing efforts will ultimately be successful, as it is affected by numerous factors, including the effectiveness of our marketing campaigns, our ability to provide consistent, high quality products and services, consumers' satisfaction with our products, as well as supports and services we provide, among others.

        In addition, any negative publicity related to our brand, products, contract manufacturers, suppliers, distribution partners, strategic partners, such as Xiaomi, third-party ecosystem partners, or celebrities we are associated with could have an adverse impact on our brand, which may negatively affect our business and results of operations.

If we fail to successfully develop and commercialize new products, services and technologies that are well received by consumers in a timely manner, our operating results may be materially and adversely affected.

        Our ability to compete successfully depends in large part on our ability to continue to introduce new and innovative products, services and technologies that are well received by consumers and in a timely manner, and in turn, grow our household user base.

        Our ability to roll out new and innovative products and services depends on a number of factors, including significant investments in research and development, quality control of our products and services and effective management of our supply chain. The execution of such initiatives can be complex and costly. As such, we could experience delays in completing the development and introduction of new products, services and technologies in the future. We may need to devote an even greater portion of our resources to the research and development of new or enhanced products, services and technologies, which may adversely affect our profitability. In addition, our research and development efforts may not yield the benefits we expect to achieve in a timely manner, or at all. To the extent we are unable to execute our

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strategy of continuously introducing new and innovative products, diversifying our product portfolio and satisfying consumers' changing preferences, we may not be able to grow our household user base and our competitive position and results of operations may be adversely affected.

Our expansion into new product categories and scenarios, and substantial increases in product lines may expose us to new challenges and more risks.

        We strive to continue to expand and diversify our IoT-enabled smart home product offerings to cover additional scenarios in the home environment. Expanding into new product categories and scenarios and substantially increasing our product lines involve new risks and challenges. Our potential lack of familiarity with new products and scenarios and the lack of relevant customer data relating to these products may make it more difficult for us to anticipate user demand and preferences. We may misjudge market demand, resulting in inventory buildup and possible inventory write-downs. We may not be able to effectively control our costs and expenses in rolling out these new product categories and scenarios. We may have certain quality issues and experience higher return rates on new products, receive more customer complaints and face costly product liability claims, such as injury allegedly or actually caused by our products, which would harm our brand and reputation as well as our financial performance.

        Furthermore, we may need to price our new products more aggressively to penetrate new markets, and gain market share or remain competitive. It may be difficult for us to achieve profitability in the new product categories and our profit margin, if any, may be lower than we anticipate, which would adversely affect our overall profitability and results of operations.

We operate in the emerging and evolving IoT-enabled smart home products market in China, which may develop more slowly or differently than we expect. If the IoT-enabled smart home products market does not grow as we expect, or if we cannot expand our products and services to meet consumer demands, our results of operations may be materially and adversely affected.

        The IoT-enabled smart home products market in China has experienced rapid growth in recent years. However, the growth rate may decrease due to uncertainties with respect to China's macro-economy, disposable income growth, the acceptance of IoT technology and products, and pace of development of technologies and other factors. Furthermore, the IoT-enabled smart home products market is constantly evolving, and it is uncertain whether our products and services will achieve and sustain high levels of demand and market acceptance. Our ability to expand the sales of our IoT products to a broader consumer base depends on several factors, including Chinese consumers' receptiveness towards and adoption of smart home AI and IoT technology, the market awareness of our brand, the timely introduction and market acceptance of our products and services, the network effects of our products and services, our ability to attract, retain and effectively train sales and marketing personnel, the effectiveness of our marketing programs, our ability to develop effective relationships with distribution partners and expand our network of offline experience stores, the cost and functionality of our products and services and the success of our competitors. If we are unsuccessful in developing and marketing our IoT products to consumers, or if these consumers do not perceive or value the benefits of our holistic IoT @ Home approach, the market for our products and services may not continue to develop or may develop more slowly than we expect, either of which would adversely affect our profitability and growth prospects.

If our user engagement ceases to grow or declines, our business and operating results may be materially and adversely affected.

        User engagement is important to our business model, as we utilize the data generated through users' interaction with our products to enhance algorithms and data analytics capabilities of our software so as to deliver a better user experience. In addition, our value-added businesses ecosystem and the virtuous cycle that we anticipate it to create depend heavily on the level of user engagement with the products and services provided by us.

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        Many factors may prevent users from continually engaging and habitually using our products, including:

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technical glitches may occur, which may prevent our products and services from operating in a smooth and reliable manner, and hence adversely affect user experience;



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we may be unable to identify and meet evolving user demands and preferences;



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we may not successfully develop functionalities that could further enhance user engagement and generate recurring revenues, or the new or updated products and services we introduce may not be favorably received by users;



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we may not be able to continue to successfully drive organic growth of users through word-of-mouth referrals, which may cause the growth of our user base to slow down or stall or require us to increase our promotion and advertising spending or devote additional resources to acquire users;



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we may be unable to prevent or combat inappropriate use of our products and services, which may lead to negative public perception of us and damage our brand or reputation;



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our competitors may launch or develop similar or disruptive products and services with better user experience, which may result in a loss of existing users or declines in new user growth;



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we may fail to address user concerns related to privacy and communication, data safety or security, and as a result, users may be deferred from using our products and services in scenarios that we hope to capture; and



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we may be compelled to modify our products and services to address requirements imposed by legislation, regulations, government policies or requests from government authorities in manners that may compromise user experience or make our products less affordable.

If we are unable to adapt to technological changes and implement technological enhancements to our products and services, our ability to remain competitive could be adversely affected.

        The IoT-enabled smart home products market is characterized by rapid technological changes, frequent introductions of new products and evolving industry standards. However, product development often requires significant lead-time and upfront investment. Our ability to attract new consumers and increase revenues from existing consumers will depend significantly on our ability to accurately anticipate changes in industry standards and to continue to appropriately fund development efforts to enhance our existing products and services or introduce new products and services in a timely manner to keep pace with technological developments. For example, voice- and gesture-control and facial- and image-recognition are important features of our IoT @ Home platform, and the technologies supporting them have been rapidly developing. If any of our competitors implement new technologies before us, those competitors may be able to provide products that are more effective or with more user-friendly features than ours, possibly at lower prices, which could adversely impact our sales and impact our market share. In addition, any delay or failure in our introduction of new or enhanced products and services could harm our business, results of operations and financial condition.

We are susceptible to supply shortages and interruptions, long lead times, and price fluctuations for raw materials and components, any of which could disrupt our supply chain and have a material adverse impact on our results of operations.

        Our product portfolio includes various product categories and product lines. Mass production of our products requires timely and adequate supply of various types of raw materials and components. All of the components and raw materials used to produce our products are sourced from third-party suppliers, and some of these components and raw materials are sourced from a limited number of suppliers or a single supplier. Therefore, we are subject to risks of shortages or discontinuation in supply, long lead times, cost

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increases and quality control issues with our suppliers. In addition, some of our suppliers may have more established relationships with our competitors, and as a result of these relationships, such suppliers may choose to limit or terminate their relationships with us or prioritize our competitors' orders in the case of supply shortages.

        In the event of a component or raw material shortage or supply interruption from suppliers, we will need to identify alternative sources of supply, which can be time-consuming, difficult to locate, and costly. We may not be able to source these components or raw materials on terms that are acceptable to us, or at all, which may undermine our ability to meet our production requirements or to fill customer orders in a timely manner. This could cause delays in shipment of our products, harm our relationships with our customers, network partners and other business partners, and adversely affect our results of operations.

        Moreover, the market prices for certain raw materials have been volatile. For example, we have experienced significant increases in the market prices for certain material raw materials used in manufacturing refrigerators recently, and we may not be able to recover these costs through selling price increases to our customers, which would have a negative effect on our financial results.

We rely on certain contract manufacturers to produce a substantial majority of our products. If we encounter issues with them, our business and results of operations could be materially and adversely affected.

        We rely on certain contract manufacturers to produce a substantial majority of our products. We may experience operational difficulties with our contract manufacturers, including reductions in the availability of production capacity, failure to comply with product specifications, insufficient quality control, failure to meet production deadlines, increases in manufacturing costs and longer lead time. Our contract manufacturers may experience disruptions in their manufacturing operations due to equipment breakdowns, labor strikes or shortages, natural disasters, component or material shortages, cost increases, violation of environmental, health or safety laws and regulations, or other problems. We may be unable to pass the cost increases to our customers. We may have disputes with our contract manufacturers, which may result in litigation expenses, divert our management's attention and cause supply shortages to us. In addition, we may not be able to renew contracts with our contract manufacturers for our existing products or identify contract manufacturers who are capable of producing new products we target to launch in the future.

        While we have constant access to each manufacturing facility of our contract manufacturers, and have quality control teams to continually monitor the manufacturing processes at our contract manufacturers' facilities, any failure of such partners to perform may have a material negative impact on our cost or supply of finished goods. In addition, if such failure affects our supplies to Xiaomi, our relationship with Xiaomi may be adversely affected.

        Furthermore, although our agreements with our contract manufacturers contain confidential obligations, and we have adopted security protocols to ensure knowhow and technologies for manufacturing our products could not be easily leaked or plagiarized, we cannot guarantee the effectiveness of these efforts and, any leakage or plagiary of our knowhow and technologies could be detrimental to our business prospects and results of operations.

We may from time to time enter into contracts with some customers that provide certain favorable terms to such customers, which may, in certain situations, adversely affect our results of operations or profitability.

        We may from time to time enter into contracts with some customers that provide certain favorable terms to such customers to expand our sales channels and increase our market penetration, which may, in certain situations, adversely affect our results of operations or profitability. For example, our contract with a leading e-commerce platform provides, among others, return or discount clearance of certain slow-moving products and potential payment of various consideration to the platform including payment for gross margin guarantee on certain products, monthly compensation for promotion and marketing

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